Re: RFC: Centralized ROCm target list + utility

[Christian Kastner <ckk@debian.org>]

Hi all,

this was included in pkg-rocm-tools_0.9.0~exp1.

On 2025-06-23 21:55, Christian Kastner wrote:
> 2. Utility
> ==========
> 
> We ship a utility to easily parse/transform the data of the master
> lists. Here is the proposed interface:
> 
> $ rocm-arch-support

This was renamed rocm-target-isa.

> $ rocm-arch-support --for-build
>   -> Prints semicolon-separated list of targets for the current source
>      package: "gfx803;gfx900;gfx906;gfx908;..."
>   -> use as eg: AMDGPU_TARGETS="$(rocm-arch-support --for-build)"

The --for-build option gained a potentially useful feature: it also
checks all build dependencies for a X-ROCm-Built-For field. If they have
such field, then the target ISA list will be reduced to the intersection
of the central list and the dependency's list.

So if a package supports fewer targets, then this propagates to all of
its reverse dependencies.

This is still open to discussion/improvement, of course. Yesterday on
the call, it was pointed out that in some cases, such a propagation
would not be wanted.


The utility also gained the feature to locally override the central list
by setting ROCM_TARGET_ISA_FIXED to a space-separated list of target ISAS.

So during package development, one could set

  export ROCM_TARGET_ISA_FIXED="gfx1030 gfx1100"

and get local builds which only target gfx1030 and gfx1100, which allows
for faster iteration, without have to modify d/rules.

This should only be done for source-only uploads, of course. Though we
rarely do binary-included builds.

Best,
Christian